Hi, running pilight in 433gpio mode works fine for xmit. All my kaku devices (old and new) switch just fine.
However in this mode pilight-receive shows an abundance of devices but does not show any kaku remote xmits. I have no LPF (yet). I read this (https://wiki.pilight.org/doku.php/instal...5d=nightly) and decided to try lirc-rpi mode. After following these instructions (https://github.com/OpenELEC/OpenELEC.tv/issues/3908) pilight starts up fine without any errors (I did check the logs). The result is:
1) xmit does not work anymore
2) pilight-receive -F datetime still shows an abundance of devices/protocols that I do not recognize. Used my kaku remote close to the receiver but no trace of that.

Do you receive:
a1) meaningful data for other devices or
a2) an abundance of data pulses

If a1), I have no explanation why you should not receive kaku protocol pulses

If a2), I would
- separate Pi and receiver modules as far as possible
- check grounding (star configuration, separate ground for data cable and power supply)
- add blocking capacitors to power grid and add tantalum/ceramic capacitors (both)
- try a different power supply
- try different antenna designs